Alright, let's work through 3988 times 3015 step by step
3988 × 3015 = 3015 × (3988)
+ 3015 × 8 resulting in 24120
+ 3015 × 80 producing 241200
+ 3015 × 900 yielding 2713500
+ 3015 × 3000 producing 9045000

= 12023820
